US Bridges

SR 77 over Tucson Wash

Fair

Pinal County, Arizona · 6.2 MI N of JCT Old SR 76 · Structure no. 00608

Built
1960
65 years old, rebuilt 1999
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
173 ft
3 main spans
Daily traffic
2,411
2021 count
Owner
State
State Highway Agency

About this bridge

SR 77 over Tucson Wash is a steel continuous stringer/multi-beam or girder carrying SR 77 over Tucson Wash in Pinal County, Arizona. It was built in 1960 and reconstructed in 1999, so it is 65 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,411 vehicles a day, roughly 17% of them trucks, projected to reach 2,421 by 2041. The structure is 173 ft (52.7 m) long and 60 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSR 77
CrossesTucson Wash
Location6.2 MI N of JCT Old SR 76
RouteState Highway 77
CountyPinal County
StateArizona
Coordinates32.7363, -110.6489
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length173 ft (52.7 m)
Longest span65 ft (19.8 m)
Deck width60 ft (18.4 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,411 (2021)
Projected traffic2,421 by 2041
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 77 over Tucson Wash built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1999.

What condition is SR 77 over Tucson Wash in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does SR 77 over Tucson Wash carry?

About 2,411 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is SR 77 over Tucson Wash?

The structure is 173 ft (52.7 m) long with a longest span of 65 ft (19.8 m) and a deck 60 ft wide.

Who owns SR 77 over Tucson Wash?

It is owned by the State Highway Agency.